30
BSC Installation and Operation Manual
TROUBLESHOOTING
No Display, or Garbled Display
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that the Ground screw is connected to a reliable Earth Ground. Make sure that all wiring is fed
to the control through the bottom knockouts and that no high voltage wiring is running behind
the control board.
SENSOR INPUTS
Display shows Sensor OPEN or SHORT
When the reading is
OPEN
, Check the sensor is connected and the wires are continuous to the
BSC. Finally follow the procedure for Incorrect Temperature or Pressure Display. When the
reading is
SHORT
, remove the wires from the sensor terminals. The display should change to
read
OPEN
. If it does not, the BSC may be damaged.
Display shows an Incorrect Temperature
Remove the wires from the sensor terminals. The display should change to read
OPEN
. If it
does not, the BSC may be damaged. Take an ohm reading across the detached sensor wires. The
ohm reading should correspond to the Temperature sensor Table. If it does not, the sensor may
be damaged.
Display shows an Incorrect Pressure
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Trim. If the reading is
SHORT
, remove the wires from the sensor terminals. The display should
change to read
OPEN
. If it does not, the BSC may be damaged.
CONTROL OPERATION
No Heat
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relays unless the Prove is shorted. Check Message Display Line on page 12.
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- The BSC will activate stage outputs when the Shutdown terminals are short. Check
Message Display Line on page 12.
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- When the Sensor Fault is set to Shutdown in the startup menu on page 7, the
System sensor fault (in all Sensor Type modes) or the Outdoor sensor fault (in Reset mode) will
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- If the System or Outdoor sensor reading was higher that the
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Too Much Heat
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- If excessive heat occurs only in certain weather conditions, adjust the
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5). If excessive heat occurs year round, reduce the Offset.
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- The BSC will only modulate boilers their mode is set to Auto or Standby. Check to if any boiler stage is set
to Manual or On. See Mode on page 24.
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21.
Temperature Sensor Chart
TEMPERATURE
(in Degrees
°
F)
Value
(in Ohms)
-30
117720
-20
82823
-10
59076
0
42683
10
31215
20
23089
25
19939
30
17264
35
14985
40
13040
45
11374
50
9944
55
8714
60
7653
70
5941
80
4649
90
3667
100
2914
110
2332
120
1879
130
1524
140
1243
150
1021
160
842
170
699
180
583
190
489
200
412
210
349
220
297
230
253
240
217
250
187
